Just install the application onto your friends' devices. Every time they tap an icon, a message pops up telling them to stop tapping. There are some cute sounds and animations in AprilFools.
It also pretends to delete your friends' devices. Watch them freak out!
Tucows, Inc has graciously donated a copy of this software to the Internet Archive's Tucows Software Archive for long term preservation and access. Please check the Tucows website for all current versions of the software.